p1656.pdf
TRANSCRIPT
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DI-134-DIAGNOSTICS ENGINE
304 Author Date
2002 ECHO (RM884U)
DTC P1656 OCV Circuit Malfunction
CIRCUIT DESCRIPTIONRefer to DTC P1349 (VVT System Malfunction) on page DI-122
DTC No DTC Detecting Condition Trouble Area
P1656
P1663Open or short in oil control valve circuit
SOpen or short in oil control valve circuit
SOil control valve
SECM
WIRING DIAGRAMRefer to DTC P1349 (VVT System Malfunction) on page DI-122 for the WIRING DIAGRAM
INSPECTION PROCEDUREHINT
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool Because freeze frame records
the engine conditions when the malfunction is detected when troubleshooting it is useful for determining
whether the vehicle was running or stopped the engine warmed up or not the air-fuel ratio lean or rich etc
at the time of the malfunction
TOYOTA hand-held tester
1 Check OCV circuit
PREPARATION
(a) Start the engine and warmed it up
(b) Connect the TOYOTA hand-held tester and select VVT from ACTIVE TEST menu
CHECK
Check the engine speed when operate the OCV by the TOYOTA hand-held tester
OK
VVT system is OFF (OCV is OFF) Normal engine speed
VVT system is ON (OCV is ON) Rough idle or engine stalled
OK Check for intermittent problems(See page DI-3 )
NG
DI6VO-04
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A09112
BE6653A09115
START
-DIAGNOSTICS ENGINE
DI-135
305 Author Date
2002 ECHO (RM884U)
2 Check operation of OCV
PREPARATION
(a) Start the engine and warmed it up
(b) Disconnect the OCV connector(c) Apply battery positive voltage between terminals of the
OCV
CHECK
Check the engine speed
OK
Rough idle or engine stalled
NG Replace OCV
OK
3 Check voltage between terminals OCV+ and OCV- of ECM connector(See page DI-122 )
NG Check and replace ECM (See page IN-29 )
OK
4 Check for open and short in harness and connector between OCV and ECM(See page IN-29 )
NG Repair or replace
OK
Check for intermitent problems(See page DI-3 )
7292019 P1656pdf
httpslidepdfcomreaderfullp1656pdf 33
A09112
BE6653A09115
START
DI-136-DIAGNOSTICS ENGINE
306 Author Date
2002 ECHO (RM884U)
OBD II scan tool (excluding TOYOTA hand-held tester)
1 Check operation of OCV
PREPARATION
(a) Start the engine and warmed it up
(b) Disconnect the OCV connector
(c) Apply battery positive voltage between terminals of the
OCV
CHECK
Check the engine speed
OK
Rough idle or engine stalled
NG Replace OCV
OK
2 Check voltage between terminals OCV+ and OCV- of ECM connector(See page DI-122 )
NG Check and replace ECM (See page IN-29 )
OK
3 Check for open and short in harness and connector between OCV and ECM(See page IN-29 )
NG Repair or replace
OK
Check for intermitent problems(See page DI-3 )
7292019 P1656pdf
httpslidepdfcomreaderfullp1656pdf 23
A09112
BE6653A09115
START
-DIAGNOSTICS ENGINE
DI-135
305 Author Date
2002 ECHO (RM884U)
2 Check operation of OCV
PREPARATION
(a) Start the engine and warmed it up
(b) Disconnect the OCV connector(c) Apply battery positive voltage between terminals of the
OCV
CHECK
Check the engine speed
OK
Rough idle or engine stalled
NG Replace OCV
OK
3 Check voltage between terminals OCV+ and OCV- of ECM connector(See page DI-122 )
NG Check and replace ECM (See page IN-29 )
OK
4 Check for open and short in harness and connector between OCV and ECM(See page IN-29 )
NG Repair or replace
OK
Check for intermitent problems(See page DI-3 )
7292019 P1656pdf
httpslidepdfcomreaderfullp1656pdf 33
A09112
BE6653A09115
START
DI-136-DIAGNOSTICS ENGINE
306 Author Date
2002 ECHO (RM884U)
OBD II scan tool (excluding TOYOTA hand-held tester)
1 Check operation of OCV
PREPARATION
(a) Start the engine and warmed it up
(b) Disconnect the OCV connector
(c) Apply battery positive voltage between terminals of the
OCV
CHECK
Check the engine speed
OK
Rough idle or engine stalled
NG Replace OCV
OK
2 Check voltage between terminals OCV+ and OCV- of ECM connector(See page DI-122 )
NG Check and replace ECM (See page IN-29 )
OK
3 Check for open and short in harness and connector between OCV and ECM(See page IN-29 )
NG Repair or replace
OK
Check for intermitent problems(See page DI-3 )
7292019 P1656pdf
httpslidepdfcomreaderfullp1656pdf 33
A09112
BE6653A09115
START
DI-136-DIAGNOSTICS ENGINE
306 Author Date
2002 ECHO (RM884U)
OBD II scan tool (excluding TOYOTA hand-held tester)
1 Check operation of OCV
PREPARATION
(a) Start the engine and warmed it up
(b) Disconnect the OCV connector
(c) Apply battery positive voltage between terminals of the
OCV
CHECK
Check the engine speed
OK
Rough idle or engine stalled
NG Replace OCV
OK
2 Check voltage between terminals OCV+ and OCV- of ECM connector(See page DI-122 )
NG Check and replace ECM (See page IN-29 )
OK
3 Check for open and short in harness and connector between OCV and ECM(See page IN-29 )
NG Repair or replace
OK
Check for intermitent problems(See page DI-3 )